What is the main difference between attack lines and supply lines?

The main difference between attack lines and supply lines lies in their specific functions during firefighting operations. Attack lines are designed for direct engagement with the fire, allowing firefighters to apply water or firefighting agents where they are needed most to suppress the flames. These lines are typically smaller in diameter and are more maneuverable, making them suitable for the dynamic environment of an active fire scene.

On the other hand, supply lines serve a critical role by delivering large volumes of water from a water source, such as a hydrant, to the attack lines. Supply lines are larger in diameter, allowing them to transport water efficiently to ensure that firefighters have a continuous and adequate supply for firefighting efforts. This distinction is crucial for effectively managing firefighting resources and ensuring that the attack lines have everything they need to combat the fire effectively.